<%@ page language="java" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<!-- 创建一个变量，保存到域对象 -->
<c:set var="key01" value="abc"></c:set>
添加之后的：${key01 }
<hr>
<c:remove var="key01"/>
删除之后的：${key01 }
</body>
</html>